PennEngineering
PennEngineering
Corporate Headquarters – Danboro, PA
5190 Old Easton Rd.
Danboro, PA 18916
Phone: 215-766-8853
Toll-Free Phone: 1-800-237-4736 (U.S. only)
Email: info@pemnet.com
Website: www.pemnet.com
Print Back
Locking and Non-locking Threads
These fasteners provide load-bearing threads in thin sheets and permit up to 0.76mm adjustment for mating hole misalignment.

The self-clinching feature offers fast and simple assembly. The fasteners are squeezed into prepared holes using any standard press. The sheet remains flush on one side, and the fastener is permanently locked in place.

Extra strength and support in assembly is obtained by the threads of the floating nut extending fully into the retainer shank (a unique PEM feature). A self-locking version of the fastener is also offered. Thread locking torque performance is equivalent to applicable NASM25027 specifications.

Non-locking Type A4 and self-locking Type LA4 fasteners provide load-bearing threads in stainless steel sheets as thin as 0.97mm with hardness up to HRB 88 on the Rockwell “B” scale.

Many PEM Type AS and AC self-clinching floating fasteners correspond to sizes in US NASM45938/11 specifications. Check our web site for a complete Military Specification and National Aerospace Standards Reference Guide (Bulletin NASM).
Floating-Nuts-non-locking
Floating Self-Clinching Fasteners - Types A4, AS, AC 2
Unit of Measure
1 

Part #

Thread Size x Pitch

A (Shank) Max.

Hole Size in Sheet + 0.08

C Max.

E ± 0.38

Fastener Material

Standard Finish - Retainer & Nut

CAD

AS-M3-1ZI N/A M3 x 0.5 N/A 0.97 mm N/A 7.37 mm N/A 7.35 mm N/A 9.14 mm N/A Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
AS-M4-1ZI N/A M4 x 0.7 N/A 0.97 mm N/A 9.35 mm N/A 9.33 mm N/A 11.18 mm N/A Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
AS-M5-1ZI N/A M5 x 0.8 N/A 0.97 mm N/A 10.31 mm N/A 10.29 mm N/A 11.94 mm N/A Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
AS-M3-2ZI N/A M3 x 0.5 N/A 1.38 mm N/A 7.37 mm N/A 7.35 mm N/A 9.14 mm N/A Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
AS-M4-2ZI N/A M4 x 0.7 N/A 1.38 mm N/A 9.35 mm N/A 9.33 mm N/A 11.18 mm N/A Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
AS-M5-2ZI N/A M5 x 0.8 N/A 1.38 mm N/A 10.31 mm N/A 10.29 mm N/A 11.94 mm N/A Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
AS-M6-2ZI N/A M6 x 1 N/A 1.38 mm N/A 13.08 mm N/A 13.06 mm N/A 15.24 mm N/A Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
AC-M3-1 N/A M3 x 0.5 N/A 0.97 mm N/A 7.37 mm N/A 7.35 mm N/A 9.14 mm N/A 300 Series Stainless Steel N/A Passivated and/or tested per ASTM A380 N/A CAD Icon (for items table)
AC-M4-1 N/A M4 x 0.7 N/A 0.97 mm N/A 9.35 mm N/A 9.33 mm N/A 11.18 mm N/A 300 Series Stainless Steel N/A Passivated and/or tested per ASTM A380 N/A CAD Icon (for items table)
AC-M5-1 N/A M5 x 0.8 N/A 0.97 mm N/A 10.31 mm N/A 10.29 mm N/A 11.94 mm N/A 300 Series Stainless Steel N/A Passivated and/or tested per ASTM A380 N/A CAD Icon (for items table)
AC-M3-2 N/A M3 x 0.5 N/A 1.38 mm N/A 7.37 mm N/A 7.35 mm N/A 9.14 mm N/A 300 Series Stainless Steel N/A Passivated and/or tested per ASTM A380 N/A CAD Icon (for items table)
AC-M4-2 N/A M4 x 0.7 N/A 1.38 mm N/A 9.35 mm N/A 9.33 mm N/A 11.18 mm N/A 300 Series Stainless Steel N/A Passivated and/or tested per ASTM A380 N/A CAD Icon (for items table)
AC-M5-2 N/A M5 x 0.8 N/A 1.38 mm N/A 10.31 mm N/A 10.29 mm N/A 11.94 mm N/A 300 Series Stainless Steel N/A Passivated and/or tested per ASTM A380 N/A CAD Icon (for items table)
AC-M6-2 N/A M6 x 1 N/A 1.38 mm N/A 13.08 mm N/A 13.06 mm N/A 15.24 mm N/A 300 Series Stainless Steel N/A Passivated and/or tested per ASTM A380 N/A CAD Icon (for items table)
A4-M3-1 N/A M3 x 0.5 N/A 0.97 mm N/A 7.37 mm N/A 7.35 mm N/A 9.14 mm N/A 400 Series Stainless Steel N/A Passivated and/or tested per ASTM A380 N/A CAD Icon (for items table)
A4-M4-1 N/A M4 x 0.7 N/A 0.97 mm N/A 9.35 mm N/A 9.33 mm N/A 11.18 mm N/A 400 Series Stainless Steel N/A Passivated and/or tested per ASTM A380 N/A CAD Icon (for items table)
A4-M5-1 N/A M5 x 0.8 N/A 0.97 mm N/A 10.31 mm N/A 10.29 mm N/A 11.94 mm N/A 400 Series Stainless Steel N/A Passivated and/or tested per ASTM A380 N/A CAD Icon (for items table)
Unit of Measure
1